GIS Analysis Functions.

GIS analysis functions use the spatial and non-spatial attribute data to answer questions about real-world. It is the spatial analysis functions that distinguish GIS from other information systems.

When use GIS to address real-world problems, you'll come up against the question that which analysis function you want to use and to solve the problems. In this case, you should be aware that wisely using functions will lead to high quality of the information produced from GIS and individual analysis functions must be used in the context of a complete analysis strategy. (Stan Aronoff, 1989)

1. Spatial Data Functions

Spatial data refers to information about the location and shape of, and relationships among, geographic features, usually stored as coordinates and topology. Spatial data functions are used to transform spatial data files, such as digitized map, edit them, and assess their accuracy. They are mainly concerned with the spatial data.

Format Transformations

Format is the pattern into which data are systematically arranged for use on a computer. Format transformations are used to get data into acceptable GIS format. Digital Files must be transformed into the data format used by the GIS, such as transforming from raster to vector data structure. A raster data often requires no re-formatting. A vector data often requires topology to be built from coordinate data, such as arc/node translations. Transformation can be very costly and time-consuming with.................!

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